问在mousedown - Sencha ExtJs中存储变量的问题

EN

    current_cursor_position: undefined, //global variable to hold the cursor position that is used when spinUp is click. Also is used to store mouse down position 

init{
        this.getView().addListener('spinup', this.spinnerUp, this);
        this.getView().addListener('spindown', this.spinnerDown, this);

        this.getView().mon(this.getView().getEl(), {
        mousedown: function(e) {

          this.current_cursor_position = //logic to find and store user current mouse click
        }
},

spinnerUp {
this.current_cursor_position = //recorded cursor position 
…
//logic to increment time
}

…